In the stock config, the 92 mm fans are mounted inside
some plastic fan cages that allow quick and toolless fan
replacement in case of failure.

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And without the fan cages:

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Originally I just screwed the fans to two aluminium L
profile bars.

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It was fixed to the middle wall with double-sided adhesive
tape. It's very strong stuff, so the fan unit falling off
was not a concern. Additionally, the tape has some thickness
to it, which should provide some dampening between the fan
unit and the middle wall.

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Unfortunately, due to some bumps on the middle wall getting in
the way, the tape on the rear angle didn't make proper contact
with the wall. It held, but not very well.

Additinoally, I noticed that there were rather strong
vibtrations on the middle wall. It turned out that the tape
did indeed offer some decoupling, but it also did not
offer any additional strength to the middle wall (i.e. no
additional stiffness), which meant the wall could easily
vibrate.

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So, I took the unit out, and while I was at it, I also cut
out some recesses for the fans which I didn't bother doing
before. I also put some dampening foam between the fans and
the alu angles.

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Aaand of course I mounted the fans the wrong way
round. Sigh.

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Disassemble again, reassemble.

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Also: Foam between the alu angles and the wall itself:(click image for full res)

This time I bolted it to the wall with some screws. Much
more solid now, no more vibrations.

In case you can't read the text, the full res version should
be more easily readable.

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The idea behind the storage topology is based on the concept
Any one of the three LSI controllers can fail and I still
have all my data available.

You'll see below that I haven't yet gotten around to
installing the Velociraptor.

I use coloured zip ties to mark the cables that go to the
different controllers.

BLUE = controller 0
YELLOW = controller 1
GREEN = controller 2

Tidiness

There isn't really any space to hide the cables, so this was
rather tricky and required three attempts until I was
satisfied with the result. In the end I hid the extra cable
behind the triple fan unit, good thing they're 38 mm fans,
which makes the space behind them just about large enough to
fit the extra cable bits.

The power cables for the disks are two cables that came with
the PSU and onto which I just put a lot more connectors
while taking off the stock connectors because those were
neither placed in the correct locations nor facing in the
right direction.

Looks harmless, right? Yeah...

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And the disks:(click image for full res)

OK then, first try:(click image for full res)

I soon realized that this wasn't going to work. The problem
was that I had the disks arranged in the same way as the
will be set up in the storage pool layout, so the disks
which go into the same storage pool were also mounted below
each other. Sounds nice in theory, but if you want to
have disk from each pool distributed among the different
controllers, you'll get quite the cable mess.

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Second Try

Next try, this time I arranged the disks to that the cables
to the controllers could be better laid out. Since I wanted
to set up all the cables for all the disk slots, even ones
that will stay empty for now, I had to shuffle the disks
around when laying out the cables.

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Better. But I still wasn't quite happy, mainly because...

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... of this:

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Third Try

This time I made sure the cables stayed tidy on both ends
while hiding the mess (which cannot be avoided since all
cables are the same length but lead to different end points,
obviously) behind the triple fan unit.

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The loop of extra cable length for the top cable loom:

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And the cable loom for controller 0, from the disk side...

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and the M/B side. Much better IMHO.

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The bottom controller had a bit more extra cable length to hide, so
that part is a bit messier.

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And the middle one:(click image for full res)

Tada! While not perfect (I'd need longer cables for that to
make cleaner runs, but I'm not buying more cables just for
the sake of that for a build that has a closed side panel),
with this iteration of my cabling I'm now rather happy: